Add a new test with clean output and warn the user that the version
without clean output will output garbled text.
Fixes#23799
Signed-off-by: Carles Cufi <carles.cufi@nordicsemi.no>
Added test suite with test cases which performs stress test
of the logger in immediate mode. There are multiple threads continuesly
logging and being preempted. Test verifies that system does not
ends up in assert or fault.
Signed-off-by: Krzysztof Chruscinski <krzysztof.chruscinski@nordicsemi.no>